[Q] [Help] hTC One phone call concern

Hi All,

Good day! My hTC One has an issue with calling as I can't hear anything at all (Even the phone ring) as well as the recipient but it works fine with Skype/Viber/WeChat (Able to communicate with these software), etc.

I guess this might not be a problem with the hardware so what should I do? I have been flash different ROM and Radio but it wont help at all. Any suggestion here please?

Unit details:
hTC One 801n
Unlocked and S-On
Viper 2.1 ROM 4.2.2

Thank you for assisting me here in advance.:good: